21212231110 has 32 divisors (see below), whose sum is σ = 43645734720. Its totient is φ = 7271240832.

The previous prime is 21212231039. The next prime is 21212231113. The reversal of 21212231110 is 1113221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212231113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334636 + ... + 392944.

It is an arithmetic number, because the mean of its divisors is an integer number (1363929210).

Almost surely, 2^21212231110 is an apocalyptic number.

21212231110 is an abundant number, since it is smaller than the sum of its proper divisors (22433503610).

21212231110 is a wasteful number, since it uses less digits than its factorization.

21212231110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63520.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21212231110 its reverse (1113221212), we get a palindrome (22325452322).

The spelling of 21212231110 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-one thousand, one hundred ten".